/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.util;

import java.util.List;

import static org.junit.Assert.assertEquals;

public class ShutdownHookManagerInspector {

  public static int getShutdownHookCount() {
    return ShutdownHookManager.get().getShutdownHooksInOrder().size();
  }

  public static void assertShutdownHookCount(int expected) {
    List<ShutdownHookManager.HookEntry> entries = ShutdownHookManager.get().getShutdownHooksInOrder();
    StringBuilder errorBuilder = new StringBuilder("Shutdown hooks:\n");
    for (ShutdownHookManager.HookEntry entry: entries) {
      errorBuilder.append(entry.getHook()).append(" Priority:").append(entry.getPriority()).append("\n");
    }
    assertEquals(errorBuilder.toString(), expected, entries.size());
  }
}
